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HARNEX™ 320 Wind Turbine Gear Oil


HARNEX 320 wind turbine gear oil is a premium synthetic lubricant designed using polyalphaolefin (PAO) chemistry to provide exceptional anti-wear/EP performance for wind turbine gearboxes.


HARNEX 320 is approved by GE as a service fill oil for Platform 1.x and 2.x turbines with Winergy gearboxes. HARNEX 320 also meets the technical requirements of Shanghai Electric and is approved for use in any gearbox on a Shanghai Electric wind turbine.

  • Do I need to buy all my stock from you?
    We’d love it if you did, but no, you don’t have to order all your lubricants from us. Some customers jump in with two feet and consolidate all their lubricant stock into the EziStock system, while others like to dip their toes in first and start with a selection of lubricants and add to it as they see fit. As with any ordering situation, the lubricants we supply is completely up to you. Only items approved by you will ever go into the system, so you won’t be finding any surprises on your monthly invoice. If you’re not wanting to keep all your eggs in one basket, you’re perfectly entitled to keep purchasing from other suppliers as well, however only EziStock items are to be kept in the EziStock storage to enable the replenishment cycle to run smoothly.
  • What happens if I reassess pricing down the track and find its cheaper with another supplier?
    It’s great to keep your finger on the pulse and be aware of all your options to make sure you’re getting the best value for your business. With EziStock you are free to add or remove stock items from the system at any time, so should you want to switch an item to another supplier you can. While it can be tempting to jump over to another supplier offering a slightly cheaper price for a product, the EziStock system also provides savings in another way, and that’s in terms of the time savings of not having to manage stock and place orders. When you include the labour cost of stock management to your product purchase cost, customers often find it would cost them more to make the switch. Of course, if you simply find the system is not for you, that’s absolutely fine. There’s no locked in contracts, and if you want it out, we’ll take it out. No questions asked, and no hard feelings.
  • Who are your replenishers?
    Our national onsite inventory replenishment team are locally contracted individuals whose sole responsibility is to count the stock, tidy and replenish. They’re not part of the sales team, they’re just a friendly bunch of folks keen to get the job done efficiently. Outside of the replenishment, we have a dedicated EziStock operations manager who does all the behind-the-scenes work including training and managing the local replenishers, organising and processing monthly EziStock orders, and adjusting stock where requested. He’s also likely to be the friendly face you’ll see setting up your EziStock storage facilities when they get installed.
  • How can we keep control if you take over stock management?
    It’s completely understandable that the prospect of handing over your stock management to a supplier can be a little daunting. In running your operations, you want to have control, and the good news is, you still will. EziStock is not about handing over control to us. Throughout the entire process everything is checked and approved by you. Nothing goes into the system without your consent, and reporting allows you to see exactly what is being used and charged for each month – the system is very transparent.
  • What if we already have a preferred supplier we like to buy from?
    There’s no doubt about it, we’re a supplier and we want your business. EziStock is a system developed for businesses looking to get the best bang for buck both in terms of the consumables they’re purchasing, but also in enabling better efficiencies and therefore productivity in the workshop. If you have another supplier you prefer to work with, that’s fine, it’s completely up to you – no hard feelings.
  • What happens if EziStock doesn't work for us?
    If the solution simply isn’t working for you, we can remove it. No worries, no hurt feelings. There’s no locked in contracts, and at the end of the day, if the solution isn’t benefitting you, it’s not benefitting us. It has to save you time and money.
  • What’s in it for Duramach? What’s the catch?
    There’s no catch. EziStock is a fully open, transparent solution, with reporting so you can see exactly what’s going on. What’s in it for us? Well we’ve got everything to gain by looking after you and your business. Duramach is not a one off sale, it’s having a loyal customer in 10 years time that we’re able to continue providing value for. Basically, your success is our success.

The challenges facing the smooth operation of wind turbine transmissions are severe: high load and torque, temperature swings, corrosion, constant stops and starts and difficult access for maintenance. What is needed is a gear oil that stands up to these working conditions, while still reducing downtime and maintenance costs.

HARNEX™ 320 Wind Turbine Gear Oil is a premium synthetic lubricant designed to provide exceptional anti-wear/extreme pressure (AW/ EP) protection and corrosion control under the toughest conditions. HARNEX 320 is specially formulated for lubricating wind turbine gearboxes for effective operation and long service life.


HARNEX 320 is designed with polyalphaolefin (PAO) chemistry to deliver good oil film thickness over a broad temperature range. High viscosity index minimizes changes in viscosity at elevated temperatures, while ensuring good low temperature fluidity of the lubricant for cold temperature operation. This helps to ensure smooth operation in all types of climates: from the tropical heat of Costa Rica to the cold prairie winters of Canada

Features & Benefits

  • Protects against micropitting and scuffing of gear teeth and provides extended bearing life under extreme conditions

  • Withstands oxidative and thermal breakdown at elevated temperatures to increase time between drain intervals, saving time and labour

  • High quality synthetic base stocks with high VI ensure good lubricant film thickness over a broad temperature range

  • Low temperature fluidity ensures smooth coldtemperature starts

  • Effective water separation

  • Resists rust and corrosion

  • Excellent air release properties

  • Excellent compatibility with seals and coatings


HARNEX 320 meets the following industry specifications:

  • AGMA 9005-E02 (EP)

  • DIN 51517-3 (CLP 320)

  • ISO 12925-1 Type CKD



HARNEX 320 is approved by GE as a service re-fill oil for the following GE wind turbines:

  • Platform 1.X with Winergy gearbox

  • Platform 2.X with Winergy gearbox



Certified Petro-Canada Product

Duramach partner with Petro-Canada to supply world-class advanced lubricants, specialty fluids and greases developed from over 30 years of research and development.


Petro-Canada lubricants continue to perform beyond expectations in virtually every industry around the globe. 

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